This EX200 practice question tests your understanding of manage users and groups. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
$ id user1
uid=1000(user1) gid=1000(user1) groups=1000(user1),10(wheel)
A user was recently added to the 'testgrp' group using `usermod -aG testgrp user1`. However, when they try to access a file owned by testgrp with permissions 660, they get permission denied. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user did not log out and log back in.
When a user is added to a supplementary group with `usermod -aG`, the group membership change does not take effect in the user's current login session. The user must log out and log back in (or start a new login shell) for the new group to be recognized by the kernel's process credential system. Without this, the user's process lacks the group ID in its supplementary group list, so access to a file with group permissions (660) is denied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The user's primary group is not testgrp.
Why it's wrong here
Primary group is not required; secondary group membership is sufficient for access.
✓
The user did not log out and log back in.
Why this is correct
The new group membership is not active until the user re-authenticates.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The file's group owner is not testgrp.
Why it's wrong here
The problem states the file is owned by testgrp, so this is not the issue.
✗
The file's ACL overrides group permissions.
Why it's wrong here
The exhibit does not indicate any ACLs, and the problem is more likely due to group membership not being refreshed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume `usermod -aG` immediately grants access, overlooking that group membership changes require a new login session to take effect in the process's credential cache.
Detailed technical explanation
How to think about this question
Under the hood, the kernel stores the user's supplementary group IDs in the `cred` structure of each process, which is populated at login time by `pam_group` or `initgroups()`. The `usermod` command updates `/etc/group` but does not send a signal to update existing processes. A common real-world scenario is automating user provisioning in scripts where a `newgrp` or `sg` command is needed to activate the group without a full logout, or using `exec su - $USER` to reinitialize the session.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Manage users and groups — This question tests Manage users and groups — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user did not log out and log back in. — When a user is added to a supplementary group with `usermod -aG`, the group membership change does not take effect in the user's current login session. The user must log out and log back in (or start a new login shell) for the new group to be recognized by the kernel's process credential system. Without this, the user's process lacks the group ID in its supplementary group list, so access to a file with group permissions (660) is denied.
What should I do if I get this EX200 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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